Metal extrusion press



Feb. 20, 1934. o. SCHLENSTEDT METAL EXTRUSION PRESS Filed Dec. 22, 1932H I Z x I wmii V////////////////W//// V i J Inventor .lttarlwy.

Patented Feb. 20, 1934 PATENT OFFICE 1,948,400 METAL EXTRUSION PRESSOswig Schlenstedt, Mulheim Ruhr Speldorf, Germany, assignor toHydraulik, Gesellschaft mit beschrankter Haftung, Duisburg, GermanyApplication December 22, 1932, Serial No.

648,431, andin Germany November 2, 1931 2 Claims.

The billets or blocks which are pressed in metal extrusion presses havehitherto been turned to an exact cylindrical shape outside the press,and in addition they have been formed with a central hole in the endface into which is inserted the mandrel before the pressing operation iscommenced. These two operations are necessary in order to exclude thepossibility of the mandrel being forced from its central position duringthe l piercing operation.

According to the invention the billets or blocks,

which have previously been placed in the holder or container, have adepression made in them and at the same time are forced into contactwith the end surface of the container facing the ram, whereby thecylindrical surface of the billet or block is brought into contact overthe whole surface of the inner wall of the holder or container.

The turning off operation thus becomes unnecessary, contact over thewhole surface of the billet or block being obtained in far moreeifective manner than heretofore.

Two constructions of the apparatus according to the invention arediagrammatically illustrated,

by way of example, in the accompanying draw- Figures 1 and 2 illustratein longitudinal section an apparatus which is introduced by hand intothe holder or container.

Figures 3 and 4 show the apparatus applied to a press.

Figure 5 illustrates a modified construction of the apparatus accordingto the invention.

The apparatus consists of a press ram 1 having the tool .2 for formingthe depression inserted in the end face. The press ram 1 is providedhollow, the cavity being numbered 3 in the 'drawmg. I

In figures 1 and 2, the press ram is provided with handles 4 to enableit to be inserted into the holder or container and for setting it uponthe.

billet or block.

In the construction according to Figures 3 and 4, the press ram 1 isprovided upon a bracket 7; this bracket is rotatable on aspindle 8,whichtion is to be centered in the holder or container,

the press ram 1 is swung round into the ambit of the plunger 11fittedwith the mandrel 12.

To effect the pressing of the billet or block in the holder or containerthe ram 1 is lowered, the plunger 11 is lowered to cause the mandrel 12to slide into the cavity 3, and to press downwardly the press ram 1which is forced into the holder or container 5 against the action of thespring 10, and, as will be seen from the drawing, the preliminarypiercing tool 2 penetrates the billet or block 6 while at the same timethe press ram 1 presses upon the billet or block so that the surfaces ofthe billet or block press closely against the wall and the bottom of theholder or container. In the apparatus according to Figures 3 and 4, thepressing operation is effected in the same way as in the apparatusaccording to Figures 1 and 2. In Figures 1 and 2, after the plunger 11has been withdrawn, the press ram 1 is lifted clear of the holder orcontainer by hand, while in Figures 3 and 4 as the plunger 11 is beingwithdrawn the spring 10 raises the press ram 1 out of and away from theholder or container 5, so that the bracket 7 may be swung away.

In the succeeding pressure stroke the mandrel 12 enters the depression13 which has been pressed by the tool 2 in the end of the billet orblock Sand in its further movement pierces the block 6 centrally underthe guidance afforded by the depression, and then the block which hasbeen exactly centered in the pressing operation is extruded.

In the construction illustrated in Figure 3, to 35 prevent the bracketfrom being bent there is provided on the plunger slide 14 of theextrusion press an adjustable pressure screw 15 which, as the plunger 11comes down upon the pressure ram 1, or a little earlier, bears againstthe bracket 7 at a position near to the spindle 8, so that the bracket'7 is moved downwardly by being simultaneously engaged in two places.

Instead of the bracket 7 being supported by a spring it may be held inthe raised position by means of a weight.

Figure 5 illustrates a modification of con-' struction of thepreliminary piercing tool in which the tool can be employed for shearingoff the remainder of the billet or block from the 10 pressed article.

I claim:

1. Apparatus forcentering blocks in the holders of metal extrusionpresses, comprising a press ram and a tool for forming a centraldepression in the block, the said tool being carried by the said pressram, a carrier for the said press ram, a support separate from the pressplunger upon which support the said carrier is movable independently ofthe plunger in opposite direc- 11 ers of metal extrusion presses,

independently of the plunger in opposite directions parallel to the pathof the plunger and also is movable into and out of the path of theplunger, means for counter-balancing the carrier and the press ram tomaintain them remote from the holder, and an adjustable abutment infixed relation to the press plunger to contact with the carrier at themoment when the plunger contacts with the press ram when the press ramis positioned in the path of the plunger and the plunger is movingtowards the holder.

OSWIG SCI-ILENSTEDT.

